Archaeotherium ROCK ROCK UNIT COLUMN PERIOD EPOCH AGES MILLIONS of YEARS AGO Common Name: Holocene Oahe .01 Pig-Like Mammal

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Archaeotherium ROCK ROCK UNIT COLUMN PERIOD EPOCH AGES MILLIONS of YEARS AGO Common Name: Holocene Oahe .01 Pig-Like Mammal

North Dakota Stratigraphy Archaeotherium ROCK ROCK UNIT COLUMN PERIOD EPOCH AGES MILLIONS OF YEARS AGO Common Name: Holocene Oahe .01 Pig-like mammal Coleharbor Pleistocene QUATERNARY Classification: 1.8 Pliocene Unnamed 5 Miocene Class: Mammalia 25 Arikaree Order: Artiodactyla Family: Entelodontidae Brule Oligocene 38 South Heart Skull of the giant pig-like mammal, Archeotherium. 400 mm long. Chadron Chalky Buttes Oligocene Brule Formation. Stark County. North Dakota State Camels Butte Eocene Golden 55 Valley Bear Den Fossil Collection. Sentinel Butte Description: TERTIARY Archaeotherium was similar in appearance to the living warthog and grew to lengths of about 4 feet. It had an elongate skull with unusual protrusions of bone on the lower jaws beneath the eyes. Bullion Paleocene Creek These boney knobs probably provided anchors for the powerful jaw muscles. Archaeotherium mostly ate roots and tubers but Slope with its powerful jaws and teeth could eat most anything, even Cannonball carrion, like modern pigs. The strong shoulder and neck muscles suggest that these animals spent much of their time rooting and Ludlow 65 grubbing in the ground. Large olfactory lobes indicate that they Hell Creek had a keen sense of smell. Fox Hills ACEOUS Pierre CRET 84 Niobrara Carlile Carbonate Calcareous Shale Claystone/Shale Siltstone Sandstone Sand & Gravel Mudstone Lignite Glacial Drift Archaeotherium. Painting courtesy of Simon and Schuster Publishing Company. Locations where fossils have been found ND State Fossil Collection Prehistoric Life of ND Map North Dakota Geological Survey Home Page.

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South Dakota to Nebraska
Geological Society of America Special Paper 325 1998 Lithostratigraphic revision and correlation of the lower part of the White River Group: South Dakota to Nebraska Dennis O. Terry, Jr. Department of Geology, University of Nebraska—Lincoln, Lincoln, Nebraska 68588-0340 ABSTRACT Lithologic correlations between type areas of the White River Group in Nebraska and South Dakota have resulted in a revised lithostratigraphy for the lower part of the White River Group. The following pedostratigraphic and lithostratigraphic units, from oldest to youngest, are newly recognized in northwestern Nebraska and can be correlated with units in the Big Badlands of South Dakota: the Yellow Mounds Pale- osol Equivalent, Interior and Weta Paleosol Equivalents, Chamberlain Pass Forma- tion, and Peanut Peak Member of the Chadron Formation. The term “Interior Paleosol Complex,” used for the brightly colored zone at the base of the White River Group in northwestern Nebraska, is abandoned in favor of a two-part division. The lower part is related to the Yellow Mounds Paleosol Series of South Dakota and rep- resents the pedogenically modified Cretaceous Pierre Shale. The upper part is com- posed of the unconformably overlying, pedogenically modified overbank mudstone facies of the Chamberlain Pass Formation (which contains the Interior and Weta Paleosol Series in South Dakota). Greenish-white channel sandstones at the base of the Chadron Formation in Nebraska (previously correlated to the Ahearn Member of the Chadron Formation in South Dakota) herein are correlated to the channel sand- stone facies of the Chamberlain Pass Formation in South Dakota. The Chamberlain Pass Formation is unconformably overlain by the Chadron Formation in South Dakota and Nebraska.
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